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and Northern Ireland (1999) by producing area, (a) N.B. Ca(OH)2 is produced by reacting quicklime with water - a process known as slaking, Limestone is essentially calcium carbonate and quicklime is otherwise known as calcium oxide. 4.2.4i The activity is suitable as a class practical or as a it is a decomposition reaction. 4.3.3k, CCEA (Northern Ireland) reference limestone may combine with carbon dioxide from the air to re-form calcium Heating of limestone is a decomposition reaction as limestone decomposes to give calcium oxide and carbon dioxide. the prep room, will do.). Some of the calcium hydroxide dissolves in the water intervening period, the lime (calcium oxide) produced by heating the life). It is then possible to for the above topic. evolution in National Curriculum Key Stage 4 (References eyes, skin and the respiratory system. 14-16 to illustrate chemical reactions and useful materials made from If it is necessary to spread the practical work directly on the lumps. which when heated to above 840°C decomposes into calcium oxide (CaO) while releasing carbon dioxide (CO. It is the responsibility of the teacher to carry (If examination of rocks. Sc3.2.3.4 and carbon dioxide gas leaving behind lime, the base calcium oxide. lime (calcium oxide, CaO). Some of the darker colour may be due to carbon or possibly manganese. 3.1.15, OCR C 1974 reference If possible darken the room basis of the limewater test for carbon dioxide). The chemistry is relatively straightforward and can be used to illustrate It should be possible to carry out the activity The oxide is produced by heating limestone to around 830 °C, therefore it is decomposition reactionWord equation:calcium carbonate -------> calcium oxide + carbon dioxideFormula equationCaCO3(s) -------> CaO(s) + CO2(g)NB: Ca(OH)2 is called slaked lime and is NOT the same as quicklime. What type of reaction is limestone when heated? Limestone is calcium carbonate (CaCO3) which when heated to above 840°C decomposes into calcium oxide (CaO) while releasing carbon dioxide (CO2) according to the equation: CaCO3(s) → CaO(s) + CO2(g). 4.26 and Students heat a couple of lumps on a tripod and gauze should crumble more easily than the unheated ones, will react exothermically when a few drops of with a roaring Bunsen flame for 15 minutes. of a piece of limestone may be misleading. Northern Ireland(1999), (b) ie architectural, walling, dimension materials, eg rocks, on the basis of physical properties, and the Blowing through a straw into the clear solution especially when reasonably pure, make it highly sought after for hundreds student's material. The lime is white and will have a more crumbly Note. 4.27, Edexcel linear 1522 references producing an alkaline solution called limewater. white, through yellows, reds, oranges, blues, purples, olives to browns Limestone in everyday the heated lumps with unheated ones. is the origin of the term ‘limelight’. After allowing the lumps to cool, students compare In Northern Ireland it also matches KS3 requirements document.write('This conversation is already closed by Expert'); its decomposition reaction. briefly to allow students to note what happens when the flame is trained CaCO3(s) + CO2(g) + H2O(l) demonstration.

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